Air diffuser

Abstract

An improved air diffuser or air boot has a unique incremental air dampering and air pattern control mechanism, namely a plurality of independent adjacent flat damper plates or blades which are adjustably attached to an inner surface of a bottom ledge just above an air outlet throat and are slideable across the throat. Each plate may be manually or automatically slid from its open position resting on the ledge to a closed position where it butts against the far side of the air outlet throat.

What is claimed is: 
     
       1. In an air diffuser having an elongated air chamber enclosed by walls, including end walls and a rear wall, and an air inlet collar and at least one elongated air outlet throat, the improvement which comprises the elongated air outlet throat has an upper end, a lower discharge end and a downwardly inclined tapered wall therebetween;   the elongated air chamber has a horizontal bottom ledge at the upper end of the elongated air outlet throat;   the horizontal bottom ledge has a plurality of independent adjacent flat damper plates adjustably attached to an inner surface of the horizontal bottom ledge and slideable across the upper end of the elongated air outlet throat; and   each damper plate has a back end with a downwardly inclined flange at the back end whose inclination is substantially the same as that of the downwardly inclined tapered wall.   
     
     
       2. The air diffuser according to claim 1, wherein the horizontal bottom ledge has a transverse row of two rivets with raised heads for each damper plate and each damper plate has an upwardly inclined portion with a transverse slot which frictionally engages the rivet heads. 
     
     
       3. The air diffuser according to claim 1, wherein each end wall has an inverted U-shaped bracket which can fit over top of a ceiling support member for directly mounting and supporting the air diffuser. 
     
     
       4. The air diffuser according to claim 1, wherein the rear wall has a rotatable winged fitting which can pass through an opposed slot in a light fixture and which can then be twist locked to attach firmly the air diffuser to the light fixture.